A battery protection plate, a battery and an electric device

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By using a separate control circuit board and power circuit board, and optimizing the wiring design, the problem of limited improvement in battery energy density and charging speed was solved, achieving high energy density and fast charging performance for the battery.

CN224501990UActive Publication Date: 2026-07-14BYD CO LTD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: BYD CO LTD
Filing Date: 2025-01-02
Publication Date: 2026-07-14

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Abstract

The utility model discloses an embodiment provides a kind of battery protection plate, battery and electric equipment, comprising: control circuit board and power circuit board;Wherein, the control circuit board and the power circuit board are electrically connected.The control circuit board and the power circuit board can be designed separately, the control circuit board and the power circuit board can realize different wiring design, to reduce the size of the control circuit board and the power circuit board respectively, to improve the energy density and charging speed of battery.

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Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a battery protection board, a battery, and electrical equipment. Background Technology

[0002] Currently, due to the portability of electrical devices, there are high requirements for battery energy density and high charging speed. Related technologies address the need for high energy density and high charging speed in portable devices by increasing the energy density of cell materials and reducing the types, number, and size of electronic components. However, without significant breakthroughs in the structure of cell materials and electronic components, improvements in battery energy density and charging speed are limited. Utility Model Content

[0003] In view of the above problems, the present invention provides a battery protection board, battery, and electrical device that overcomes or at least partially solves the above problems.

[0004] To address the aforementioned problems, in a first aspect, this utility model discloses a battery protection board, comprising: a control circuit board and a power circuit board; wherein...

[0005] The control circuit board and the power circuit board are electrically connected.

[0006] Optionally, the battery protection board further includes functional elements adapted to perform at least one of signal acquisition, signal processing, and signal control functions;

[0007] At least some of the functional elements are arranged on the control circuit board.

[0008] Optionally, functional elements suitable for implementing the signal processing and signal control are integrated on the same control circuit board.

[0009] Optionally, functional elements suitable for implementing the signal processing and those suitable for implementing the signal control are respectively integrated on at least two of the control circuit boards.

[0010] Optionally, power devices are arranged on the power circuit board, and the power devices include at least one of switches, relays, fuses, and resistors.

[0011] Optionally, the overcurrent capacity of the power circuit board is greater than that of the control circuit board.

[0012] Optionally, the power circuit board has fewer routing layers than the control circuit board, and / or,

[0013] The power circuit board has fewer types of traces than the control circuit board, and / or,

[0014] The trace width of the power circuit board is greater than the trace width of the control circuit board, and / or,

[0015] The copper foil thickness of the power circuit board is greater than that of the control circuit board.

[0016] Optionally, the control circuit board is provided with a plurality of wires suitable for electrical connection;

[0017] The width of the line is 0.07-0.3mm.

[0018] Optionally, the control circuit board is provided with a plurality of wires suitable for electrical connection;

[0019] The spacing between adjacent lines is 0.07-0.3 mm.

[0020] Optionally, the control circuit board is disposed on the power circuit board.

[0021] Optionally, along a first direction, the orthographic projection of the control circuit board falls within the orthographic projection of the power circuit board, where the first direction is the direction from the control circuit board to the power circuit board.

[0022] Optionally, the area of the cross-section of the control circuit board perpendicular to the first direction is 1-300 mm². 2 The first direction is the direction from the control circuit board to the power circuit board.

[0023] Optionally, the control circuit board is provided with a first input / output interface, and the power circuit board is provided with a second input / output interface;

[0024] The second input / output interface is electrically connected to the first input / output interface.

[0025] Optionally, the first input / output interface is located on the side of the control circuit board facing or away from the power circuit board.

[0026] Optionally, the second input / output interface is located on the side of the power circuit board facing or away from the control circuit board.

[0027] Optionally, the first input / output interface and the second input / output interface are welded together.

[0028] Optionally, the control circuit board includes a first surface and a second surface disposed opposite to each other along a first direction, the second surface facing the power circuit board, and the first direction being the direction from the control circuit board to the power circuit board;

[0029] The first input / output interface is located on the circumferential edge of the second surface.

[0030] Optionally, the control circuit board has an outward-facing groove on its circumferential side, and the groove extends through the control circuit board along the first direction. The groove is adjacent to the first input / output interface.

[0031] The first direction is open.

[0032] Optionally, the groove wall is coated with a first metal layer for tinning.

[0033] Optionally, the control circuit board is provided with a through hole extending along the first direction, and the through hole is connected to the first input / output interface.

[0034] Optionally, the sidewalls of the via are coated with a second metal layer for soldering.

[0035] Optionally, the orthographic projection of the first input / output interface along the first direction falls within the orthographic projection of the second input / output interface along the first direction;

[0036] The first direction is the direction from the control circuit board to the power circuit board.

[0037] Optionally, the first input / output interface has a first circumferential edge, and the second input / output interface has a second circumferential edge;

[0038] Along the direction from the center region of the first input / output interface to the first circumferential edge, at least a portion of the distance between the second circumferential edge and the first circumferential edge is 0.02-0.8 mm.

[0039] Optionally, the number of both the first input / output interface and the second input / output interface may include multiple interfaces.

[0040] Multiple first input / output interfaces are arranged at circumferential intervals along the control circuit board, and multiple second input / output interfaces are arranged correspondingly to multiple first input / output interfaces.

[0041] Optionally, the battery protection board may further include reinforcement components;

[0042] The reinforcement components are fixedly connected to the control circuit board and the power circuit board respectively, and are adapted to reinforce the connection between the control circuit board and the power circuit board.

[0043] Secondly, this utility model provides a battery, including the aforementioned battery protection board.

[0044] Thirdly, this utility model provides an electrical device, including the aforementioned battery.

[0045] The embodiments of this utility model have the following advantages:

[0046] In this embodiment of the invention, the control circuit board and the power circuit board can be designed separately, allowing for different wiring designs and facilitating a reduction in their respective sizes to improve battery energy density and charging speed. Furthermore, the electrical connection between the control circuit board and the power circuit board enables signal transmission between them. Attached Figure Description

[0047] Figure 1 This is an exploded structural diagram of a battery protection board according to this utility model;

[0048] Figure 2 This is a schematic diagram of the connection structure of a battery protection board according to this utility model;

[0049] Figure 3 This is one of the partial assembly drawings of a battery protection board according to this utility model;

[0050] Figure 4 This is a second partial assembly drawing of a battery protection board according to this utility model;

[0051] Figure 5 This is a front view of a control circuit board according to this utility model;

[0052] Figure 6 This is a schematic diagram of the structure of a control circuit board according to this utility model;

[0053] Figure 7 This is a schematic diagram of the wiring structure of a control circuit board according to this utility model;

[0054] Figure 8 This is a schematic diagram of the wiring structure of another control circuit board of this utility model;

[0055] Figure 9 This is an exploded structural diagram of another battery protection board according to this utility model;

[0056] Figure 10 This is the third partial assembly drawing of a battery protection board according to this utility model;

[0057] Figure 11 This is the fourth partial assembly drawing of a battery protection board according to this utility model;

[0058] Figure 12This is a front view of another control circuit board of this utility model;

[0059] Figure 13 This is a schematic diagram of another control circuit board of this utility model;

[0060] Figure 14 This is a schematic diagram of the structure of another control circuit board of this utility model;

[0061] Figure 15 This is an exploded structural diagram of another battery protection board of this utility model;

[0062] Figure 16 This is the fifth partial assembly drawing of a battery protection board according to this utility model;

[0063] Figure 17 This is the sixth partial assembly drawing of a battery protection board according to this utility model;

[0064] Figure 18 This is a front view of another control circuit board of this utility model;

[0065] Figure 19 This is a schematic diagram of another control circuit board of this utility model.

[0066] Explanation of reference numerals in the attached figures:

[0067] 1. Control circuit board; 11. First input / output interface; 12. First surface; 13. Second surface; 14. Groove; 15. Through hole; 2. Functional component; 4. Power circuit board; 41. Second input / output interface; 5. Power device; 6. Solder; 7. Reinforcing component. Detailed Implementation

[0068] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0069] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0070] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0071] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal conduction of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0072] One of the core concepts of this utility model embodiment lies in disclosing a battery protection board, such as... Figure 1 As shown, it may specifically include: a control circuit board 1 and a power circuit board 4; the control circuit board 1 and the power circuit board 4 are electrically connected.

[0073] In this embodiment of the invention, the control circuit board 1 and the power circuit board 4 can be designed separately, allowing for different wiring designs and facilitating a reduction in their respective sizes to improve battery energy density and charging speed. Furthermore, the electrical connection between the control circuit board 1 and the power circuit board 4 enables signal transmission between them.

[0074] Specifically, both the control circuit board 1 and the power circuit board 4 can be PCB boards. The control circuit board 1 can be directly electrically connected to the power circuit board 4, or the control circuit board 1 can be connected to it via an adapter.

[0075] Power circuit board 4 is electrically connected.

[0076] In some embodiments, the battery protection board further includes a functional element 2, which is adapted to perform at least one of the functions of signal acquisition, signal processing and signal control; at least some of the functional elements 2 are arranged on the control circuit board 1.

[0077] In this embodiment of the utility model, some functional elements 2 are arranged on the control circuit board 1, so that the control circuit board 1 can transmit at least one of the acquisition signal, processing signal and control signal.

[0078] Specifically, functional element 2 is adapted to perform one, two, or three functions: signal acquisition, signal processing, and signal control. Functional element 2 may include control elements, signal elements, chips, etc. For example, the functional element may be an IC, or it may be a transistor, a relay, and other functional elements such as resistors and capacitors related to the control chip for current limiting, voltage regulation, and filtering.

[0079] In some embodiments, the functional elements 2 suitable for signal processing and signal control are arranged on the control circuit board 1, which facilitates the centralized arrangement of the functional elements 2 with signal processing and signal control functions, and simplifies the wiring arrangement of the control circuit board 1 and the power circuit board 4.

[0080] In some embodiments, functional elements 2 suitable for signal processing and signal control can be integrated on the same control circuit board 1, so that the control circuit board 1 is integrated into a single unit.

[0081] In other embodiments, the functional elements 2 suitable for signal processing and signal control can be integrated on at least two control circuit boards 1, so that the control circuit boards 1 can be split into multiple smaller boards.

[0082] Optionally, power devices 5 may be arranged on the power circuit board 4, and the power devices 5 may include at least one of switches, relays, fuses, and resistors.

[0083] In this embodiment of the invention, power devices 5 such as switches, relays, fuses, and resistors are arranged on the power circuit board 4, which facilitates reducing the number of wiring layers on the power circuit board 4.

[0084] Specifically, the power device 5 can be disposed on the side of the power circuit board 4 facing the control circuit board 1, so that the power device 5 and the control circuit board 1 can be disposed on the same side of the power circuit board 4; or, the power device 5 can also be disposed on the side of the power circuit board 4 away from the control circuit board 1, so that the power device 5 and the control circuit board 1 can be disposed on opposite sides of the power circuit board 4.

[0085] Specifically, power device 5 can be a semiconductor device for power processing, capable of withstanding high voltage and carrying large current. Power device 5 can realize various functions such as voltage transformation, frequency conversion, and power management.

[0086] Function.

[0087] Optionally, the overcurrent capacity of the power circuit board 4 can be greater than that of the control circuit board 1. In this way, by making different wiring arrangements for the power circuit board 4 and the control circuit board 1, the energy density and charging speed of the battery can be improved.

[0088] In some embodiments, the power circuit board 4 has fewer wiring layers than the control circuit board 1.

[0089] In this embodiment of the invention, since the power circuit board 4 is fabricated separately, the amount of wiring in the battery protection board can be reduced by reducing the number of wiring layers on the power circuit board 4.

[0090] In some embodiments, the number of trace layers of the power circuit board 4 is D, where 1 ≤ D ≤ 6.

[0091] Specifically, the trace layers of power circuit board 4 are the wiring layers on power circuit board 4. Each trace layer is arranged independently. The number of trace layers that power circuit board 4 has represents the number of layers in its structure. Similarly, the number of trace layers that control circuit board 1 has represents the number of layers in its structure.

[0092] In some embodiments, the power circuit board 4 has fewer types of wiring than the control circuit board 1.

[0093] In this embodiment of the invention, since the power circuit board 4 is fabricated separately, the design difficulty of the battery protection board can be reduced by decreasing the types of wiring on the power circuit board 4.

[0094] In some embodiments, the trace width of the power circuit board 4 is greater than the trace width of the control circuit board 1.

[0095] In this embodiment of the invention, since the control circuit board 1 is manufactured separately, the amount of wiring used in the battery protection board can be reduced by decreasing the wiring width of the control circuit board 1.

[0096] In some embodiments, the copper thickness of the power circuit board 4 is greater than the copper thickness of the control circuit board 1.

[0097] In this embodiment of the invention, since the control circuit board 1 is manufactured separately, it is convenient to reduce the amount of copper used in the battery protection board by reducing the copper thickness of the control circuit board 1.

[0098] Specifically, the trace layer is arranged on the copper foil, the copper foil thickness of the power circuit board 4 is less than the thickness of the power circuit board 4, and the copper foil thickness of the control circuit board 1 is less than the thickness of the control circuit board 1.

[0099] Optionally, the control circuit board 1 has multiple wires suitable for electrical connection; the wires are 0.07-0.3mm wide, which makes it easier to reduce the size of the control circuit board 1 and facilitates the versatility of the control circuit board 1.

[0100] Specifically, the control circuit board 1 can be an HDI circuit board, which is manufactured using blind and buried via processes. The width of the lines can be further controlled to be 0.05-0.3mm to further reduce the size of the control circuit board 1.

[0101] Specifically, the control circuit board 1 can also use a chip packaging substrate, which can further control the line width to be 0.005-0.15mm, so as to further reduce the size of the control circuit board 1.

[0102] Optionally, the control circuit board 1 has multiple wires suitable for electrical connection arranged on it; the spacing between adjacent wire bundles is 0.07-0.3mm, which makes the wiring arrangement area on the control circuit board 1 small, which makes it easier to reduce the size of the control circuit board 1 and facilitates the versatility of the control circuit board 1.

[0103] In some alternative embodiments, the control circuit board 1 can be disposed on the power circuit board 4, so that the control circuit board 1 and the power circuit board 4 are directly connected, which can improve the stability and reliability of signal transmission between the control circuit board 1 and the power circuit board 4.

[0104] Specifically, the control circuit board 1 can be arranged opposite to the power circuit board 4. The side of the control circuit board 1 away from the power circuit board 4 can be equipped with functional elements 2, and the power circuit board 4 can be equipped with power devices 5. Since the control circuit board 1 and the power circuit board 4 are electrically connected, the functional elements 2 and the power devices 5 can also be electrically connected.

[0105] Specifically, the control circuit board 1 and the power circuit board 4 can be two independently set circuit boards. For the battery protection board, the battery protection board can include a power area and a control area. In some embodiments, the power area can be provided with an independent power circuit board 4, and the control area can be provided with an independent control circuit board 1. That is, the power area and the control area of the battery protection board can be arranged independently.

[0106] Furthermore, the power circuit board 4 can be designed with thick copper foil, large trace width, fewer trace types, and fewer or more layers of traces to meet the requirements of simple trace attributes and high overcurrent in the power area. Moreover, the power circuit board 4 is free from signal line obstruction, has a larger effective copper foil area, and can also improve the overcurrent capability of the power circuit board 4. Alternatively, while meeting the overcurrent capability requirements, the width of the power circuit board 4 can be narrowed to provide space for the battery cells and increase battery capacity.

[0107] Specifically, the control circuit board 1 can adopt a thin copper sheet, multiple types of traces, small trace width, and multi-layer line design to meet the needs of the control area for multiple trace attributes, low current, and a large variety and number of functional components 2, and can avoid the problem of signal interference.

[0108] Specifically, in this embodiment of the invention, the power circuit board 4 and the control circuit board 1 are separated and set up independently, so that the power circuit board 4 and the control circuit board 1 can adapt to different design requirements. In this way, the physical contradiction of the battery protection board being required to have both multiple layers and fewer layers of traces, as well as both thick and thin copper layers, can be solved. It is not necessary to take into account both the power area and the control area on a single circuit board, which can reduce the design and manufacturing difficulty of the battery protection board. Moreover, the battery protection board can also achieve narrowing and high current overcurrent capability, and can achieve high energy density and fast charging of the battery.

[0109] Optionally, along a first direction, the orthographic projection of the control circuit board 1 falls within the orthographic projection of the power circuit board 4, where the first direction is the direction from the control circuit board 1 to the power circuit board 4.

[0110] In this embodiment of the invention, the orthographic projection of the control circuit board 1 along the first direction falls within the orthographic projection of the power circuit board 4 along the first direction, which can improve the reliability of arranging the control circuit board 1 on the power circuit board 4.

[0111] Specifically, the first direction is consistent with the thickness direction of the control circuit board 1. Optionally, the thickness of the control circuit board 1 along the first direction is 0.1-1.6 mm.

[0112] Optionally, the cross-sectional area of the control circuit board 1 perpendicular to the first direction can be 1-300 mm². 2 The first direction can be the direction from the control circuit board 1 to the power circuit board 4, which makes the size of the control circuit board 1 smaller and facilitates the universality of the control circuit board 1.

[0113] Furthermore, the length of the control circuit board 1 along the second direction can be 1-30mm, and the width along the third direction can be 1-10mm, so that the cross-sectional area of the control circuit board 1 perpendicular to the first direction can be 1-300mm². 2 .

[0114] Optionally, the cross-sectional area of the control circuit board 1 perpendicular to the first direction can also be greater than 1 mm². 2 or less than 300mm 2 wait.

[0115] In some optional embodiments of this utility model, combined with Figures 1 to 6As shown, the control circuit board 1 is provided with a first input / output interface 11, and the power circuit board 4 is provided with a second input / output interface 41; the second input / output interface 41 is electrically connected to the first input / output interface 11.

[0116] In this embodiment of the invention, the second input / output interface 41 is electrically connected to the first input / output interface 11, facilitating signal transmission between the control circuit board 1 and the power circuit board 4. Furthermore, different control circuit boards 1 can be matched with the same type of power circuit board 4, improving the versatility of the power circuit board 4.

[0117] Specifically, the connection method of the first input / output interface 11 and the second input / output interface 41 can be a detachable connection, or it can be a fixed connection such as welding or bonding. This embodiment of the utility model does not make specific limitations in this regard.

[0118] Specifically, the attributes of the first input / output interface 11 may include voltage signals, current signals, temperature signals, MOS trigger signals, etc., that is, the first input / output interface 11 may include interfaces for voltage, current, temperature, switch control signals, etc.

[0119] Specifically, the properties of the second input / output interface 41 are set to correspond to the properties of the first input / output interface 11.

[0120] Specifically, such as Figure 2 As shown, functional element 2 is a control chip. The control circuit board 1 is set as an intermediary between the control chip and the power circuit board 4 to ensure the uniformity of the first input / output interface 11. This allows for the unification of interfaces for different control chips, enabling different control chips to share the same power circuit board 4. In the same project, different types of control chips can be matched with the same power circuit board 4 through different wiring layers inside the control circuit board 1, resulting in better versatility of the power circuit board 4 and shortening the development cycle of the battery protection board.

[0121] Specifically, in different projects, the control circuit board 1 is serialized and standardized to ensure the universality and standardization of the control chip. Different projects can design power circuit boards 4 with different requirements, so that the same control chip can be matched with multiple power circuit boards 4. Since the power circuit board 4 has fewer layers and simpler circuits, its design is simple and the manufacturing cycle is short. It can also reduce the requirements for the level of designers, reduce the design time, reduce the design difficulty and prototyping cycle of the battery protection board, and shorten the project development cycle.

[0122] Optionally, the cross-sectional shape of the first input / output interface 11 perpendicular to the first direction includes at least one of rectangle, circle, ellipse, and elongated shape, which can improve the structural diversity of the first input / output interface 11.

[0123] Optionally, the cross-sectional shape of the second input / output interface 41 perpendicular to the first direction includes at least one of rectangle, circle, ellipse, and elongated shape, which can improve the structural diversity of the second input / output interface 41.

[0124] Optionally, the first input / output interface 11 can be located on the side of the control circuit board 1 facing or away from the power circuit board 4, which can improve the diversity of electrical connections between the control circuit board 1 and the power circuit board 4.

[0125] Optionally, the second input / output interface 41 can be located on the side of the power circuit board 4 facing or away from the control circuit board 1, which can improve the versatility of the electrical connection between the control circuit board 1 and the power circuit board 4.

[0126] Optionally, the first input / output interface 11 and the second input / output interface 41 can be soldered together to ensure the reliability and conductivity of the connection between the first input / output interface 11 and the second input / output interface 41, so as to facilitate signal exchange between the first input / output interface 11 and the second input / output interface 41.

[0127] Specifically, both the first input / output interface 11 and the second input / output interface 41 can be represented by solder pads to improve the ease of soldering the first input / output interface 11 and the second input / output interface 41. The first input / output interface 11 and the second input / output interface 41 can be soldered using solder or solder paste or other solder materials 6.

[0128] Specifically, in order to provide a certain buffering performance for the soldering between the first input / output interface 11 and the second input / output interface 41, the thickness of the solder material or solder paste 6 along the first direction can be controlled to be between 0.01 and 1.0 mm. For example, the thickness of the solder material or solder paste 6 along the first direction can be 0.008 mm, 0.01 mm, 0.2 mm, 0.9 mm, or 1.0 mm, etc.

[0129] Specifically, balls can be placed in the first input / output interface 11 to serve as leads of the control circuit board 1. That is, the first input / output interface 11 and the second input / output interface 41 can be soldered using ball grid array packaging technology to avoid the problem of cold solder joints.

[0130] Specifically, the side of the first input / output interface 11 facing the second input / output interface 41 can be a flat surface, or a material storage tank can be formed therein. The side of the second input / output interface 41 facing the first input / output interface 11 can be a flat surface, or a material storage tank can be formed therein, etc.

[0131] In some alternative embodiments of the present invention, the control circuit board 1 includes a first surface 12 and a second surface 13 disposed opposite to each other along the first direction, the second surface 13 facing the power circuit board 4, and the first direction being the direction from the control circuit board 1 to the power circuit board 4; the first input / output interface 11 is disposed near the circumferential edge of the second surface 13.

[0132] In this embodiment of the invention, the first input / output interface 11 is located near the circumferential edge of the second surface 13, which facilitates observation of the connection quality between the first input / output interface 11 and the second input / output interface 41, thereby improving the connection reliability between the first input / output interface 11 and the second input / output interface 41.

[0133] Specifically, the first input / output interface 11 can be located at the circumferential edge of the second surface 13, or

[0134] The region of the second surface 13 near the circumferential edge.

[0135] Optionally, such as Figures 9 to 14 As shown, the control circuit board 1 has an outward-facing groove 14 on its circumferential side, and the groove 14 penetrates the control circuit board 1 along the first direction. The groove 14 is connected to the first input / output interface 11 along the first direction.

[0136] In this embodiment of the utility model, the groove opening of the groove 14 is set outward from the circumferential side plate of the control circuit board 1, so that the groove 14 can serve as an observation window, making it easy to observe the connection quality between the first input / output interface 11 and the second input / output interface 41 through the groove opening of the groove 14.

[0137] Specifically, the groove 14 is connected to the first input / output interface 11 along the first direction, which facilitates the solder to climb into the groove 14. The contact area between the solder 6 and the control circuit board 1 is increased, which further improves the reliability of the connection between the first input / output interface 11 and the second input / output interface 41.

[0138] Optionally, the walls of the groove 14 are coated with a first metal layer for soldering.

[0139] In this embodiment of the invention, a first metal layer is coated on the groove wall of the groove 14 to facilitate the wetting and climbing of the solder 6, thereby increasing the contact area between the solder 6 and the control circuit board 1 and improving the reliability and firmness of the connection between the control circuit board 1 and the power circuit board 4.

[0140] Specifically, the first metal layer can be a copper layer or a copper alloy layer, etc.

[0141] Specifically, a notch may also be provided at the position of the first input / output interface 11 opposite to the groove 14 so that the solder 6 can climb from the notch into the groove 14.

[0142] For example, when soldering the first input / output interface 11 and the second input / output interface 41, the solder 6 rises from the side of the first input / output interface 11 away from the control circuit board 1 to the groove 14 through wetting. It can be observed through the groove 14 whether the solder 6 has melted and whether the soldering is well wetted. Moreover, the solder 6 has a large number of distribution positions, which makes it easier to increase the connection area between the control circuit board 1 and the power circuit board 4, thereby ensuring the reliability of the connection between the control circuit board 1 and the power circuit board 4.

[0143] Optionally, such as Figures 15 to 19 As shown, the control circuit board 1 is provided with a through hole 15 extending along the first direction. The through hole 15 is connected to the first input / output interface 11, so that the through hole 15 can serve as an observation window to facilitate observation of the connection quality between the first input / output interface 11 and the second input / output interface 41.

[0144] Specifically, a through hole can also be provided at the position opposite to the first input / output interface 11 and the through hole 15, so as to enable the through hole 15 to conduct through the first input / output interface 11, so that observation can be performed through the through hole.

[0145] Whether the solder 6 between the first input / output interface 11 and the second input / output interface 41 has melted.

[0146] Optionally, the sidewalls of the via 15 may be coated with a second metal layer, which can be used for soldering.

[0147] In this embodiment of the invention, a second metal layer is coated on the sidewall of the through hole 15 to facilitate the solder 6 to penetrate and climb into the through hole, thereby increasing the contact area between the solder 6 and the control circuit board 1 and improving the reliability and robustness of the connection between the control circuit board 1 and the power circuit board 4.

[0148] Specifically, the second metal layer can be a copper layer or a copper alloy layer, etc.

[0149] For example, when soldering the first input / output interface 11 and the second input / output interface 41, the solder 6 rises from the side of the first input / output interface 11 away from the control circuit board 1 through the wetting action into the through hole 15. It is possible to observe through the through hole 15 whether the solder paste has melted and whether the soldering is well wetted. Moreover, after the solder 6 enters the through hole 15, it becomes a nail-like structure, which makes the control circuit board 1 firmly embedded on the power circuit board 4. The nail-like structure can also provide a connection reinforcement function, thereby ensuring the reliability of the connection between the control circuit board 1 and the power circuit board 4.

[0150] Furthermore, the power circuit board 4 may include a first region and a second region. The second input / output structure may be arranged in the first region, and the power device 5 may be arranged in the second region. To ensure sufficient solder 6 for transition or to form a longer nail-like structure, the amount of solder 6 used in the first region may exceed the amount used in the second region. When adding solder 6 in the first region, a stepped steel mesh may be used for application. The step size of the stepped steel mesh may be 0.01-1.0 mm. Furthermore, the opening area of the stepped steel mesh may be increased. For example, the opening area of the stepped steel mesh may be 105%-150% of the area of the cross-section of the first input / output interface 11 perpendicular to the first direction.

[0151] In some alternative embodiments of this utility model, the orthographic projection of the first input / output interface 11 along the first direction falls within the orthographic projection of the second input / output interface 41 along the first direction. The first direction is the direction from the control circuit board 1 to the power circuit board 4, which makes the size of the second input / output interface 41 larger. This can avoid misalignment when the first input / output interface 11 and the second input / output interface 41 are connected, and the connection quality between the first input / output interface 11 and the second input / output interface 41 can be observed through the edge of the second input / output interface 41, so as to ensure the reliability of the connection between the first input / output interface 11 and the second input / output interface 41.

[0152] Specifically, such as Figure 3 As shown, the first input / output interface 11 and the second input / output interface are soldered.

[0153] Taking port 41 as an example, you can observe whether the solder paste has melted and whether the soldering is well wetted by looking at the edge of the second input / output interface 41.

[0154] Furthermore, the first input / output interface 11 has a first circumferential edge, and the second input / output interface 41 has a second circumferential edge; along the direction from the central region of the first input / output interface 11 to the first circumferential edge, the distance between at least a portion of the second circumferential edge and the first circumferential edge is 0.02-0.8 mm, so that at least a portion of the second circumferential edge can serve as a good observation window.

[0155] Optionally, the distance between at least part of the second circumferential edge and the first circumferential edge may be greater than 0.02 mm or less than 0.8 mm, etc., so as to facilitate observation of the welding status of the first input / output interface 11 and the second input / output interface 41.

[0156] Specifically, along the direction from the center region of the first input / output interface 11 to the first circumferential edge, a section of the second circumferential edge may have a gap with the first circumferential edge, or the second circumferential edge may have a gap with the first circumferential edge in all directions.

[0157] Optionally, the number of first input / output interfaces 11 and second input / output interfaces 41 may include multiple; multiple first input / output interfaces 11 are arranged at circumferential intervals along the control circuit board 1, and multiple second input / output interfaces 41 are arranged correspondingly to multiple first input / output interfaces 11.

[0158] In this embodiment of the invention, the second input / output interface 41 is configured to correspond with the first input / output interface 11, which facilitates the improvement of the reliability of signal transmission between the control circuit board 1 and the power circuit board 4.

[0159] Specifically, there are multiple first input / output interfaces 11 and multiple second input / output interfaces 41, which facilitates the formation of more signal transmission paths between the control circuit board 1 and the power circuit board 4. Moreover, it allows the power circuit board 4 to be adapted to a variety of different control circuit boards 1.

[0160] Specifically, the first input / output interface 11 and the second input / output interface 41 can be one-to-one, many-to-one, or one-to-many, etc. This utility model embodiment takes the one-to-one relationship between the first input / output interface 11 and the second input / output interface 41 as an example for explanation. Other situations can be set with reference.

[0161] For example, the power circuit board 4 can be provided with three second input / output interfaces 41. One type of control circuit board 1 can be provided with three first input / output interfaces 11, but only transmits signals through two of them; another type of control circuit board 1 can be provided with three first input / output interfaces 11, and transmits signals through all three. The power circuit board 4 can be adapted to these two different control circuit boards 1 and meet their signal transmission requirements.

[0162] Specifically, a control chip compatible with 2-6S batteries can be used to accommodate different battery cell numbers by adjusting whether or not the functional components 2 on the control circuit board 1 are mounted, or by using different functional components 2. For example... Figure 7 and Figure 8 As shown, if C17 in U2 is shorted, BC4+ is not connected, and C18 in U1 is shorted, the number of battery cells in series can be changed from 4 to 3. If C17 and C15 in U2 are shorted, and C18 and C16 in U1 are shorted, the number of battery cells in series can be changed from 4 to 2.

[0163] In some alternative embodiments of this utility model, such as Figure 4As shown, the battery protection board may also include a reinforcement member 7; the reinforcement member 7 can be fixedly connected to the control circuit board 1 and the power circuit board 4 respectively, which is suitable for reinforcing the connection between the control circuit board 1 and the power circuit board 4, and helps to ensure the connection between the control circuit board 1 and the power circuit board 4.

[0164] Specifically, the material of the reinforcement 7 can be selected from filler glue, epoxy glue, etc., and the reinforcement 7 can be an adhesive layer formed between the control circuit board 1 and the power circuit board 4.

[0165] The battery protection board described in this embodiment of the present invention has at least the following advantages:

[0166] In this embodiment of the invention, the control circuit board and the power circuit board can be designed separately, allowing for different wiring designs and facilitating a reduction in their respective sizes to improve battery energy density and charging speed. Furthermore, the electrical connection between the control circuit board and the power circuit board enables signal transmission between them.

[0167] Secondly, this utility model also discloses a battery, which may specifically include the aforementioned battery protection board.

[0168] The battery described in this embodiment of the present invention can achieve the same beneficial effects as the battery protection board described above, and will not be described again in this embodiment of the present invention.

[0169] Thirdly, this utility model embodiment also discloses an electrical device, which may specifically include the aforementioned battery.

[0170] Specifically, the battery can provide power to the electrical device, which includes, but is not limited to, vehicles, mobile phones, computers, etc.

[0171] The electrical equipment described in this embodiment of the present invention can achieve the same beneficial effects as the battery described above, and will not be described in detail in this embodiment of the present invention.

[0172] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0173] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0174] The present invention provides a detailed description of a battery protection board, a battery, and an electrical device. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, those skilled in the art will recognize that there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery protection board, characterized in that, include: Control circuit board (1) and power circuit board (4); wherein, The control circuit board (1) and the power circuit board (4) are electrically connected; The control circuit board (1) is provided with a first input / output interface (11), and the power circuit board (4) is provided with a second input / output interface (41). The second input / output interface (41) is electrically connected to the first input / output interface (11).

2. The battery protection board according to claim 1, characterized in that, The battery protection board also includes a functional element (2), which is adapted to perform at least one of the functions of signal acquisition, signal processing and signal control; At least some of the functional elements (2) are arranged on the control circuit board (1).

3. The battery protection board according to claim 2, characterized in that, Functional elements (2) suitable for implementing the signal processing and signal control are arranged on the control circuit board (1).

4. The battery protection board according to claim 3, characterized in that, Functional elements (2) suitable for implementing the signal processing and signal control are integrated on the same control circuit board (1).

5. The battery protection board according to claim 3, characterized in that, Functional elements (2) suitable for implementing the signal processing and suitable for implementing the signal control are respectively integrated on at least two of the control circuit boards (1).

6. The battery protection board according to claim 1, characterized in that, The power circuit board (4) is provided with power devices (5), which include at least one of switches, relays, fuses and resistors.

7. The battery protection board according to claim 1, characterized in that, The overcurrent capacity of the power circuit board (4) is greater than that of the control circuit board (1).

8. The battery protection board according to claim 7, characterized in that, The power circuit board (4) has fewer wiring layers than the control circuit board (1), and / or, The power circuit board (4) has fewer types of wiring than the control circuit board (1), and / or, The trace width of the power circuit board (4) is greater than the trace width of the control circuit board (1), and / or, The copper foil thickness of the power circuit board (4) is greater than that of the control circuit board (1).

9. The battery protection board according to any one of claims 1 to 8, characterized in that, The control circuit board (1) has multiple wires suitable for electrical connection. The width of the line is 0.07-0.3mm.

10. The battery protection board according to any one of claims 1 to 8, characterized in that, The control circuit board (1) has multiple wires suitable for electrical connection. The spacing between adjacent lines is 0.07-0.3 mm.

11. The battery protection board according to claim 1, characterized in that, The control circuit board (1) is mounted on the power circuit board (4).

12. The battery protection board according to claim 11, characterized in that, Along the first direction, the orthographic projection of the control circuit board (1) falls within the orthographic projection of the power circuit board (4), and the first direction is the direction from the control circuit board (1) to the power circuit board (4).

13. The battery protection board according to claim 11, characterized in that, The area of the cross section of the control circuit board (1) perpendicular to the first direction is 1-300 mm², and the first direction is the direction from the control circuit board (1) to the power circuit board (4).

14. The battery protection board according to claim 11, characterized in that, The first input / output interface (11) is located on the side of the control circuit board (1) facing or away from the power circuit board (4).

15. The battery protection board according to claim 11, characterized in that, The second input / output interface (41) is located on the side of the power circuit board (4) facing or away from the control circuit board (1).

16. The battery protection board according to claim 11, characterized in that, The first input / output interface (11) and the second input / output interface (41) are welded together.

17. The battery protection board according to claim 16, characterized in that, The control circuit board (1) includes a first surface (12) and a second surface (13) disposed opposite to each other along a first direction, the second surface (13) facing the power circuit board (4), and the first direction is the direction from the control circuit board (1) to the power circuit board (4); The first input / output interface (11) is located near the circumferential edge of the second surface (13).

18. The battery protection board according to claim 17, characterized in that, The control circuit board (1) has a groove (14) with an outward opening on its circumferential side, and the groove (14) penetrates the control circuit board (1) along the first direction. The groove (14) is connected to the first input / output interface (11) along the first direction.

19. The battery protection board according to claim 18, characterized in that, The groove (14) has a first metal layer coated on its wall, which is used for tinning.

20. The battery protection board according to claim 17, characterized in that, The control circuit board (1) is provided with a through hole (15) extending along the first direction, and the through hole (15) is connected to the first input / output interface (11).

21. The battery protection board according to claim 20, characterized in that, The sidewalls of the through hole (15) are coated with a second metal layer, which is used for tinning.

22. The battery protection board according to any one of claims 11 to 21, characterized in that, The orthographic projection of the first input / output interface (11) along the first direction falls within the orthographic projection of the second input / output interface (41) along the first direction; The first direction is the direction from the control circuit board (1) to the power circuit board (4).

23. The battery protection board according to claim 22, characterized in that, The first input / output interface (11) has a first circumferential edge, and the second input / output interface (41) has a second circumferential edge; Along the direction from the center region of the first input / output interface (11) to the first circumferential edge, the distance between at least a portion of the second circumferential edge and the first circumferential edge is 0.02-0.8 mm.

24. The battery protection board according to any one of claims 11 to 21, characterized in that, The number of the first input / output interface (11) and the second input / output interface (41) both includes multiples; Multiple first input / output interfaces (11) are arranged at circumferential intervals along the control circuit board (1), and multiple second input / output interfaces (41) and multiple first input / output interfaces (11) are arranged correspondingly.

25. The battery protection board according to claim 11, characterized in that, The battery protection board also includes reinforcement components (7). The reinforcement component (7) is fixedly connected to the control circuit board (1) and the power circuit board (4) respectively, and is suitable for reinforcing the connection between the control circuit board (1) and the power circuit board (4).

26. A battery, characterized in that, Includes the battery protection board as described in any one of claims 1-25.

27. An electrical appliance, characterized in that, Includes the battery as described in claim 26.